Dictionary

Find definitions for:

pol'y•al•pha•bet'ic substitu'tion

Pronunciation: (pol'ē-al"fu-bet'ik, pol"ē-),[key]Cryptography.a system of substitution that mixes together a number of cipher alphabets in a cryptogram so that each plaintext letter is represented by a cipher that repeatedly changes. Cf. monoalphabetic substitution.